The Collaborative International Dictionary of English v.0.48:

Abstemious \Ab*ste"mi*ous\, a. [L. abstemius; ab, abs + root of
   temetum intoxicating drink.]
   1. Abstaining from wine. [Orig. Latin sense.]
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            Under his special eye
            Abstemious I grew up and thrived amain. --Milton.
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   2. Sparing in diet; refraining from a free use of food and
      strong drinks; temperate; abstinent; sparing in the
      indulgence of the appetite or passions.
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            Instances of longevity are chiefly among the
            abstemious.                           --Arbuthnot.
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   3. Sparingly used; used with temperance or moderation; as, an
      abstemious diet. --Gibbon.
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   4. Marked by, or spent in, abstinence; as, an abstemious
      life. "One abstemious day." --Pope.
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   5. Promotive of abstemiousness. [R.]
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            Such is the virtue of the abstemious well. --Dryden.
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WordNet (r) 3.0 (2006):

abstemious
    adj 1: sparing in consumption of especially food and drink; "the
           pleasures of the table, never of much consequence to one
           naturally abstemious"- John Galsworthy [ant:
           gluttonous]
    2: marked by temperance in indulgence; "abstemious with the use
       of adverbs"; "a light eater"; "a light smoker"; "ate a light
       supper" [syn: abstemious, light(a)]